Insulator pin and process of manufacturing the same



Aug. 28, 1928; 1,682,590

A. o. AUSTIN I INSULATOR PIN AND PROCESS OF MANUFACTURING THE SAME Original Filed larch 1 1923 Cami/7 7 of/ead or 29/2 M @M' Mqr 6 Patented Aug. 2a, 1928.

UNITED STATES PATENT OFFICE.

mans. o. aus'rm. or smna'ron, OHIO, ASSIGNOB, BY IESNE assremm's, are m omo muss comm, or mar-man, OHIO, a conromnou NEW JERSEY.

A msm'ron PIN AND PROCESS OF MANUFACTURING THE SAME.

011311181 application fled mall. 1, 1928, Serial N0. 821,866. Divided and this application filed October 22, 1825. Serial No. 64,281.

This invention relates to a process of manufacturing insulator pins 1n which the pm is provided with an msulator supportmg tip of soft metal such as lead.

The object of the mventlon 1s to provide an improved rocess for securmg the t p to the pin, which shall be more rellable in its operation than methods heretofore used, and which shall rovide a better 11111011 between the in an its tip.

The inv ntion is exemplified by the combination and arrangement of parts and by the steps of process described 1n the following specification and illustrated in the accompanying draw ng and 1t 1s more art1cularl pointed out mthe appendedca ms.

The present application 1s a d1v1s1on of m prior application Serial No. 621,966, filed Milrch 1, 1923.

In the drawing the figure 1s a sectlonal view of an insulator pin tip havmg the 1nvention applied thereto.

While this invention has especlal advantages as applied to insulator P1118, 1t W111 be understood'that certain features of the invention, as pointed out in the appended claims, are of general appllcatlon and I do not, therefore, wish to restrlct the appl1ca-;

' tion of the invention to an particular article that there is difliculty owing to the lead exce t as pointed out in t e claims.

While lead tipped pins have been used 1n a number of instances, it frequently hapfpens in or becoming" loose on the main bod of the pin. In order to eliminate the di ficulties experienced in ordinary lead-tipped pins the improved method embodying the present apphcation has been adopted. The main body portion 10 of the 1p, made of steel or other suitable materia 1s first galvanized. After galvanizin pin which is to e covere by the lead t1p is. laced in a suitable flux such as zinc chlori e or hydrochloric acid. If the flux contains water it is allowed to dry so that 1t will not cause serious spattering when placed.

in the lead, The tip of the pin is then the end of the placed in a molten lead bath, where the flux permlts amalgamation between the zinc and the lead. At the same time that the amalgamatlon is taking place the tip of the pin is heated so that the lead will become per- 1 nanently attached to the same when the pin is placed in the die and molten lead cast around the end, this being done while the pin is still heated from its immersion in the lead bath. The preliminary lead coating and the molded lead cover are shown somewhat diagrammatically and a propriately labeled in the drawing. In ad ltion to the amalgamation the pin is usually roughened or grooved, which affords more surface and a better grlp between the lead and the body of the pin. The roughening may also be done in such a way as to increase the efiective size of the pin, thereb giving the lead much better support. Th1s 1s of great advantage where high loads are to be applied or carried by the m.

Another metho of securin the. desired result is to tin the tip or end with tin or a compound which will melt readily and amalgamate with the lead when the same is cast on the pin. This method insures a bond between the lead or tip and the body of the pin so that the same will not become loose, and permits the pin being used on higher mechanical loads. In some cases a blank only is cast on the tip of the pin and a thread cut or pressed in the same.

The melting temperature of lead from which the molded tip may be formed is 328 C. While that of tin is 321 C. and that of zinc with which the pin is galvanized is 419 C. The preliminary coating given the galvanized tin in the presence of a flux is formed of a metal, the melting point of which is no higher than that of the molded tip. This insures complete union of this coating with the molded ti which could not be so readily or surely e ective if the ti were molded directly on the pin.

l claim:

1. The process of manufacturing insulator pins wherein the portion of said pin to which the insulator is to be secured 1s sub- "ected to a flux and coated with a relatively thin coat of metal, after which a thimble of relatively soft metal is formed upon said coated portion. 7

2. The process of manufacturing an insulator support wherein a galvanized pin is subjected to a fluxing material and dlpped into molten lead to impart a thin coat ng of lead thereto, after whlch a thimble of ead is molded onto said. coated portion.

3. The process of manufacturing an insulator support wherein a galvanized pm is subjecte after which the portion of said pin having said flux thereon is dipped into' a molten metal to impart a thin coating of metal thereto, and a thimble of soft metal is molded about said coated portion while said pm is still heated.

4. The process of manufacturing an article having a coating of metal body is given a coating of metal differing from the material of said body, and thereafter a covering of a third metal 1s applied to said body over said coating.

5. The process of manufacturin an article wherein a ferrous body member is first galvanized and thereaftera layer of lead applied to the galvanized body.

6. The process of manufacturing a metal article wherein a ferrous body isgalvanized, the galvanized body being then dipped into molten lead, and thereafter .a layer of lead molded over the coating of lead produced by said-di ping.

7. e process of manufacturing a metal article wherein a \ferrous body member is galvanized, after which flux is applied thereto and the article dipped in a bath'of molten metal, after which a lead covering is molded on said member while said member is still heated from the immersion in said molten metal.

8AA galvanized pin having a portion thereof coated with a metal which has a relatively low melting point and having a covering dis osed about said coated part this being 0 metal having a melting point at least as high as that of the coating.

9. The process of manufacturing an insulator pin, com rising the steps of coating a portion of t e pin with a metal having a lower melting oint than that of the pin, and thereafter orming a layer of metal over said coating, the metal of said layer having a melting point at least as high as the melting point of said coating.

10.The process of manufacturing an insulator support with a thimble of relatively soft metal, comprising the steps of subjecting a portion of the pin to a fluxing material, then dipping the fluxed portion in a to zinc chloride to provide a flux,

soft metal wherein a bath of molten metal, the melting point of which does not exceed that of the metal of which the thimble is composed, and then molding upon said coated portion a thimble of. relatively soft metal.

11. Theprocess of manufacturing insulator pins provided with a lead thimble, comprlsing the steps of fluxing a portion of the pin, then dipping the fluxed'portion in a bath of molten metal, the melting point of which does not exceed that of lead, and then molding a thimble of lead onto the coated ortion.

12. T e process of ap lying a lead thimble to a a vanized ins ator support, compr1s1ng t e steps of subjecting a portion of the pin to a fluxing material, then dipping the fiuxed portion in a bath of molten metal which has av melting point not exceeding that of lead to impart a thin coating thereto, and then molding a thimble of lead upon said coated portion.

13. The process of manufacturing an in- 7 sulator in, comprising the steps of galvanizmg a errous pin body, applying a fluxing material to a portion of the galvanized body, dipping said portion in a, molten metal having a melting point lower than the melting point of zinc to apply a coatin of said metal to said portion, and therea er molding a covering of soft metal upon said coated portion, the metal used for said coverm having a melting point at least as high as t e meltmg point of the metal used for said coating. 4

14. An insulator support having a port1o n thereof coated with metal, the meltin polnt of which is lower than that of said support, and a covering of soft metal on said coated portion, the melting point of the soft metal covering being at least as high as that of said coating.

15. An insulator support comprising 'a galvanized member having a portion thereof covered with a coating of metal, and a layer of metal disposed on said covered portion, the meltmg point of said layer of metal bemg at least as high as that of said coating.

16. An insulator pin comprising a galvanized pin body, a lead tip on said pin body, and a thin coatin interposed between said lead tip and pin union between said tip and body, said coating being formed of a metal having a lower melting point than zinc and one not exceed ing that of lead. a I

17. An. sulator in of ferrous metal and a soft metal tip ormed on said in and alloyed with the metal of said pin ormin 'a continuous molecular union between sai pin and ti 18. An insulator pin of ferrous metal, a

dy to insure close soft metal tip formed on said pin and an intermediate layer of metal interposed between said pin and tip and alloyed with the metal of said pin and tip and forming a continuous molecular union between said pin and tip.

19. An insulator pin of ferrous metal having the outer surface thereof galvanized and a lead tip formed on said pin, the

galvanizing coating of said pin being alloyed with the metal of said pin and tip to form a continuous molecular union between said pin and tip.

In testimony whereof I have signed my name to this specification on this 17th day of October, A. D. 1925.

ARTHUR O. AUSTIN. 

